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Int Ophthalmol. 2017 Aug;37(4):957-964. doi: 10.1007/s10792-016-0359-4. Epub 2016 Sep 24.

Pseudolentogenic astigmatic effect of multifocal intraocular lenses: non-corneal ocular residual astigmatism (N-CORA) as a new parameter in astigmatic change analysis.

Author information

1
Department of Ophthalmology, University Medical Centre Hamburg-Eppendorf (UKE), Martinistraße 52, 20246, Hamburg, Germany. andi.frings@gmail.com.
2
Department of Ophthalmology, University Medical Centre Hamburg-Eppendorf (UKE), Martinistraße 52, 20246, Hamburg, Germany.
3
Care Vision Refractive Centers, Hamburg, Germany.
4
zentrumsehstärke, Augenarztpraxis am UKE, Hamburg, Germany.

Abstract

PURPOSE:

This study was initiated to introduce the term non-corneal ocular residual astigmatism (N-CORA) as a new parameter in astigmatic change analysis after implantation of two different types of non-toric, multifocal intraocular lenses (MIOL).

METHODS:

Seventy-two eyes from 72 consecutive patients after MIOL surgery were studied in terms of a retrospective, cross-sectional data analysis. Two types of spherical MIOL were used. Surgical technique in all patients was a 2.4-mm incision phacoemulsification, performed by one surgeon. To investigate the magnitude and axis of astigmatic changes, the true corneal astigmatism and Alpins vector method were applied.

RESULTS:

There were no statistically significant between-group differences related to the preoperative refraction or ocular residual astigmatism (ORA). After surgery, the mean refractive surgically induced astigmatism (RSIA) and the topographic SIA (TSIA) did not differ significantly between the lenses. The magnitude and orientation of ORA and N-CORA changed after surgery.

CONCLUSIONS:

There are no statistically significant differences in postoperative ORA in magnitude or axis when implanting different types of MIOL. The similarity of N-CORA between both MIOL types shows that both diffractive and refractive asymmetric MIOLs with plate haptics have the same pseudolentogenic astigmatic effect which could be presented in terms of the newly introduced parameter N-CORA.

KEYWORDS:

Alpins vector method; Multifocal intraocular lens; Ocular residual astigmatism; Topographic astigmatism

PMID:
27665612
DOI:
10.1007/s10792-016-0359-4
[Indexed for MEDLINE]

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